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Business Segments (Schedule Of Net Sales By Product Group) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Revenue from External Customer [Line Items] |  |  |
Net Sales by Product Group | $ 677,892 | $ 903,582 | $ 798,223
Cash and cash equivalents | 9,660 | 19,232 |
Foreign Country |  |  |
Revenue from External Customer [Line Items] |  |  |
Cash and cash equivalents | 9,800 | 10,300 |
PE Films |  |  |
Revenue from External Customer [Line Items] |  |  |
Net Sales by Product Group | 76,763 | 97,571 | 118,920
Aluminum Extrusions |  |  |
Revenue from External Customer [Line Items] |  |  |
Net Sales by Product Group | 474,803 | 637,872 | 539,325
Flexible Packaging Films |  |  |
Revenue from External Customer [Line Items] |  |  |
Net Sales by Product Group | 126,326 | 168,139 | 139,978
Personal Care Materials | PE Films |  |  |
Revenue from External Customer [Line Items] |  |  |
Net Sales by Product Group | 29,300 | 29,431 | 30,484
Surface protection films | PE Films |  |  |
Revenue from External Customer [Line Items] |  |  |
Net Sales by Product Group | 47,463 | 68,140 | 88,436
Subtotal | PE Films |  |  |
Revenue from External Customer [Line Items] |  |  |
Net Sales by Product Group | 76,763 | 97,571 | 118,920
Nonresidential building & construction | Aluminum Extrusions |  |  |
Revenue from External Customer [Line Items] |  |  |
Net Sales by Product Group | 264,780 | 338,981 | 269,252
Consumer durables | Aluminum Extrusions |  |  |
Revenue from External Customer [Line Items] |  |  |
Net Sales by Product Group | 38,897 | 62,541 | 53,578
Residential building & construction | Aluminum Extrusions |  |  |
Revenue from External Customer [Line Items] |  |  |
Net Sales by Product Group | 38,388 | 64,268 | 52,236
Machinery and Equipment | Aluminum Extrusions |  |  |
Revenue from External Customer [Line Items] |  |  |
Net Sales by Product Group | 43,759 | 63,326 | 42,721
Automotive | Aluminum Extrusions |  |  |
Revenue from External Customer [Line Items] |  |  |
Net Sales by Product Group | 48,046 | 51,286 | 43,256
Distribution | Aluminum Extrusions |  |  |
Revenue from External Customer [Line Items] |  |  |
Net Sales by Product Group | 14,331 | 29,732 | 45,639
Electrical | Aluminum Extrusions |  |  |
Revenue from External Customer [Line Items] |  |  |
Net Sales by Product Group | 26,602 | 27,738 | 32,643
Subtotal | Aluminum Extrusions |  |  |
Revenue from External Customer [Line Items] |  |  |
Net Sales by Product Group | $ 474,803 | $ 637,872 | $ 539,325

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